Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Can anyone workout the gains of firing the piston closer to TDC than normal?

Smokingwheels · 03-10-2013, 09:46 PM

I need someone to help me calculate the improved efficiency in theory, maybe post a question at a physics forum or a mechanical engineering forum.

Thanks in advance but do not mention smokingwheels...Please..

The figures I have measured at various RPMs.

3.76 Deg ATDC eg -3.76 Deg for 750 RPM at Wide open throttle (WOT).
10.57 Deg BTDC for 2970 RPM WOT.
27.2 Deg BTDC for 5565 RPM WOT.

The raw calibration data is on sound cloud https://soundcloud.com/smokingwheels...ation-jan-2013
You will have to convert the MP3 files to WAV files (eg CDEX freeware) then look at the pluses in a wave editor and measure them. The firing pulse has a duration of 1 mS usually the top trace.
The distributor offset is approx 62 Deg BTDC when looking at the sound files.

03-10-2013, 09:46 PM	#1 (permalink)
Smokingwheels EcoModding Lurker Join Date: Feb 2011 Location: Australia Posts: 21 Smokingwheels - '84 Nissan Bluebird wagon LX 90 day: 35.99 mpg (US) Red Z - '79 Nissan 280 ZX Blue Ford - '95 Ford Falcon GLI 90 day: 18.18 mpg (US) Thanks: 0 Thanked 1 Time in 1 Post	Can anyone workout the gains of firing the piston closer to TDC than normal? I need someone to help me calculate the improved efficiency in theory, maybe post a question at a physics forum or a mechanical engineering forum. Thanks in advance but do not mention smokingwheels...Please.. The figures I have measured at various RPMs. 3.76 Deg ATDC eg -3.76 Deg for 750 RPM at Wide open throttle (WOT). 10.57 Deg BTDC for 2970 RPM WOT. 27.2 Deg BTDC for 5565 RPM WOT. The raw calibration data is on sound cloud https://soundcloud.com/smokingwheels...ation-jan-2013 You will have to convert the MP3 files to WAV files (eg CDEX freeware) then look at the pluses in a wave editor and measure them. The firing pulse has a duration of 1 mS usually the top trace. The distributor offset is approx 62 Deg BTDC when looking at the sound files.